Final answer:
The main blood supply to the capital femoral epiphysis in a 10-year-old child is supplied from the femoral artery. The femoral artery is a continuation of the external iliac artery and supplies blood to the lower limbs.
Step-by-step explanation:
The main blood supply to the capital femoral epiphysis in a 10-year-old child is supplied from the femoral artery. The femoral artery is a continuation of the external iliac artery and supplies blood to the lower limbs. It gives off several smaller branches, including the lateral deep femoral artery and the genicular artery, which provide blood to the region of the knee.